Following on from my introduction thread, I have a weird fuel leak on my bike (97 FV)
If I leave the bike overnight, with either the fuel tap on or, off there's a puddle of petrol under it by morning.
The fuel tap definately closes completely, so it can't be a problem with the carbs.
The tank is currently sat on top of our wheelie bins, full up, with the fuel tap turned off, and there's not a drop coming from anywhere. What the hell is going on, any thoughts?

There is a constant stream of vapour coming from the breather pipe, but I take it thats normal and anyway, there's no petrol coming out of it?
Is the breather on the right outlet (its on the rear as i face the tap) ? would it make a difference?

Here's a picture in case there's something obvious.

Any help appreciated, the suns out and all I want to do is get out on my new bike!!!

If no fuel leaks when the tap is closed then unless there is a hole in you tank somewhere (unlikely) then there isnt really anywhere else to lose it from as it wont normally drop through the breather unless you really overfill the tank!

If no fuel leaks when the tap is closed then unless there is a hole in you tank somewhere (unlikely) then there isnt really anywhere else to lose it from as it wont normally drop through the breather unless you really overfill the tank!

I really don't think it is though, with the tap shut, no fuel is making it as far as the carbs?

Quote:

Originally Posted by Tazfiend

What about the fuel pump? I don't know how much it holds, but maybe it's losing fuel overnight?

Could be, hopefully I'll find out tomorrow morning.

I left it all day whilst we were out, came home and it's lost a few mls through the breather pipe.
I've drained the tank again ,and had a good look inside with a torch but there's no corrosion at all on the breather tube, it all looks pretty sound inside

So, I've put the tank back on the bike (not bolted) and left the bike on the side stand and I've put bottles under each of the overflows and left the side panels off so the fuel pump is clearly visible.
I ran it for a few minutes too to draw fuel through everything to replicate me coming back from a ride so, hopefully tomorrow morning, I'll find the source of it.
Although, if it is that breather, the only solution is a new tank isn't it?

hi murv, hope you received the fuel tap, however as you now have added more info can i suggest you check between the carbs. the fuel line goes from the tank into a :T: piece and 2 fuel lines then go in between carbs 1and2 and carbs 3and 4. there is plastic T piece that has O rings on them that supplies fuel to the carb bodies, when i rebuilt mine the o rings had distorted/perished and i was leaking fuel from between the carbs, i got new O rings from the guy in victoria station manchester [a top bloke] someone on here will tell you his name, i cant remember at the moment, ill see if i can find a photo of my carbs to post, hope this is of some use and makes sense, JEFFA

Hi murv, can you see the 2 brown connecting t pieces between 1-2 and 3-4 carbs, half way up the photo, these have the O rings on where they go into the carb bodies, run a cloth or tissue between the carbs and see if the leak is there,hope this helps, JEFFA